MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

A metal rod is heated to t°C. A metal rod has length, area of cross-section, Young's modulus and coefficient of linear expansion as 'L', 'A', 'Y' and 'a' respectively. When the rod is heated, the work performed is ______.

A metal rod of Young's moduls 'Y' and coefficient of linear expansion 'a' has its temeprature raised by 'Δ θ'. The linear stress to prevent the expansion of rod is ______.
(L and l is original length of rod and expansion respectively)

The equation of a plane progressive wave is y = 0.09sin8 `pi` `["t" - "x"/20]`.When it is reflected at a rigid support, its amplitude becomes `2/3`rd of its 3 previous value. The equation of the reflected wave is ______.

The time of revolution of an electron around a nucleus of charge Ze in n^th Bohr orbit is directly proportional to ____________.

Average kinetic energy of H₂ molecule at 300K is 'E'. At the same temperature, average kinetic energy of O₂ molecule will be ______.

The force of gravitation between two bodies of mass 1 kg each separated by a distance of 1 m in vacuum is ____________.

When an electron in hydrogen atom is excited from its 3^rd to 5^th stationary orbit, tbe change in angular momentum of electron is (Planck's constant: h = 6.62 x 10-³⁴ Js) ____________.

The polarizing angle for a transparent medium is 'θ' and 'V' is the speed of light in that medium, then relation between 'θ' and 'V' is (c = velocity of light).

Choose the CORRECT statement from the following.

Brewster's angle for a transparent medium is ______.

When a beam of unpolarised monochromatic light is incident on a plane glass plate at a polarizing angle, then which one of the following statements is correct?

In hydrogen spectnun, the wavelengths of light emited in a series of spectral lines is given by the equation `1/lambda = "R"(1/3^2 - 1/"n"^2)`, where n = 4, 5, 6 .... And 'R' is Rydberg's constant.
Identify the series and wavelenth region.

Angular speed of an electron in the ground state of hydrogen atom is 4 × 10¹⁶ rad/s. What is its angular speed in 4^th orbit?

Ratio of centripetal acceleration for an electron revolving in 3^rd orbit to 5^th orbit of hydrogen atom is ______.

A hot body at a temperature 'T' is kept in a surrounding of temperature 'T₀'. It takes time 't₁' to cool from 'T' to 'T₂', time t₂ to cool from 'T₂' to 'T₃' and time 't₃' to cool from 'T₃' to 'T₄'. If (T - T₂) = (T₂ - T₃) = (T₃ - T₄), then ______.

An electron of mass 'm' is rotating in first Bohr orbit of radius 'r' in hydrogen atom. The orbital acceleration of the electron in first orbit (h = Planck's constant).

In Bohr model, speed of electron in nth orbit of hydrogen atom is ______. (b = Planck's constant, n = principal quantum number, ∈₀ is the permittivity of free space, e = electronic charge)

An A.C. generator produced an output voltage e = 170 sin 327t volt, where t is in seconds. The frequency of A.C. voltage is nearly ____________.

The minimum energy required to excite a hydrogen atom from its ground state is ____________.

In Bohr's model of hydrogen atom, which of the following pairs of quantities are quantized?

Assuming the expression for the pressure exerted by the gas on the wall of the container, it can be shown that pressure is ______.